London to hit 33°C before cold front sweeps away heat by FridayLondon will bake at 33°C on Wednesday before a cold front sweeps in, dropping temperatures to 24°C by Friday. Sauron turns London into Mordor: A continental heat plume locks London at 33°CLondon's urban heat island effect will amplify the Mordor-like effect, trapping Sauron (solar) energy within its concrete forge overnight. Chapter II: Gandalf & The Eagles Arrive – The Heat BreaksJust as London seems doomed to bake indefinitely, Gandalf the Cold Front will sweep in from the west on Thursday morning. Driving ahead of the maritime boundary, he will strike down the heat dome over Britain, bringing 7.3 mm of rain to Newcastle. Germany and Poland will ignite to 36°C as Berlin, Magdeburg, and Dresden feel the full force of the heat London escapes.